Runes of Magic US / AU

The only information I can give and know are:

1)Once you have a guild castle it is not a requirement to participate in siege wars because you have to sign up in order to participate in it.

2)You upgrade your castle with wood,ore,herbs,gold,guild runes, and rubies.

3)Once you have a castle which is at lvl 5 you will automatically be given a guild bank.

Sorry if I couldn't answer anymore..

Here is a good link for some information on Guilds:
http://www.theromwiki.com/Runes_of_Magic_Wiki
Once on that page, scroll down for section named: Game Features. Within that section there is a ton of info related to guilds.

Hope this suffices in answering all your questions.

<Moved to Questions and Answers>

you should probably consider joining a guild and learning about the guild castle before trying to start your own without having any knowledge about them.